Triphenylmethane dye.



-UNITED STATES PATENT orrrcn.

'- MAX wnnnaf'orlmnnrnnn, 'ennmanv, assmnon 'ro mnnnnrnmm vow. rmnnm new a 00., or ELBEBCFELD, GERMANY, A conroaa'rron or onnum.

.TRIPHENY LMETHANE DYE.

No Drwing.

To all whom it may concern Be itknown that I,--MAx WEILER, doctor of philosophy, chemist, citizen of the German Empire, residing at Elberfeld, Germany, have invented new and useful'Improvements in New Blue Dye, of which the following is a. specification. The present I invention relates to the manufacture and production of a new triparts of strong sulfuric acid at about 20-35" L 0., until the aldehyde can no more be proved to be present in the mixture. The melt is poured in 600 parts of ice water and filtered oil". The leuco acid can be further purified by dissolving it in sodaand sepalrating it again with an acid. The product t us ble in acetone. The acetone solution assumes an intense blue color by heating it with bichromate and sulfuric acid. Ferric chlorid gives in an alcoholic solution a pure blue tint. For oxidation the leuco acid is dissolved in strong sulfuric acid and the solution is stirred with the addition of the necessary quantity of nitrite at 30-35 C. until the quantity of the dyestuif produced does no longer increase. The melt is poured on ice. The dyestufi' thus separated is after. being dried -and pulverized a red powder. It is slightly soluble in hot water with a red color and easily soluble in caustic soda lye with an intense violet .color, and has pro ably the following formula:

Specification of Letters Patent. Application med February 7, 1911. Serial No. 607,173.

roduced is insoluble in water, easily solub e in chloroform and very easily solu- Patented 0017- 3, 1911.

CHI o i no,

in which formula two atoms .pf bromin are substitui :d in the oxybenzne nucleus substituted in the oxybenzene nucleus.

which is after bein dried and pulverized a red powder solub e in hot water with a red color, soluble in caustic soda lye with a violet color; dyeing chromed wool green- 35 ish-blue shades, substantially as described. In testimony whereof I have hereunto set my hand in the presence of-two subscribing witnesses.

' MAX WEILER.v [1 s.] Witnesses:

CHAS 'J. WRIGHT, WALTER VONNEGUT. 

